Windows ISO image download

 Windows 8: works on the same hardware that powers Windows 7:
 System Requirements:
 Processor: 1 gigahertz (GHz) or faster
 RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
 Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
 Graphics card: Microsoft DirectX 9 graphics device with WDDM driver
 Additional requirements to use certain features:
 To use touch, you need a tablet or a monitor that 
 supports multitouch.
 To access the Windows Store and to download and run apps,
 you need an active Internet connection and a screen resolution 
 of   at  least 1024 x 768.
 To snap apps, you need a screen resolution of at least 1366 x 768.
 Internet access (ISP fees might apply)
 Microsoft account (LiveID) required for some features
 Some features such as touch and Client Hyper-V may require 
 advanced or Windows 8 certified hardware

Microsoft Windows 8 that is the only operating system that runs on tablet, smartphones and desktop, making everyday office software works on all devices. 

Windows 8  DOWNLOAD link 

Windows 8 Pro ISO Download

Windows 7 All in One:

 System Requirements:
 Processor: 1 gigahertz (GHz) or faster
 RAM: 1 (GB) (32-bit) or 1 GB (64-bit)
 Hard disk space: 16 GB (32-bit) or 20 GB (64-bit)
 Graphics card: Microsoft DirectX 9 graphics device. 

 Windows 7 Home Premium x86 English  Download link
 Windows 7 Home Premium x64 English  Download link
 Windows 7 Professional x86 English  Download link
 Windows 7 Ultimate x86 English  Download link

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Windows xp Download : 

 System Requirements:
 Processor: 1 gigahertz (GHz) or faster
 RAM: 256 kilobyte (GB) (32-bit) or 512 mb (64-bit)
 Hard disk space: 2 GB (32-bit) or 2 GB (64-bit)
 Graphics card: Microsoft DirectX 9 graphics device.

 Windows xp sp2 iso Full  Download link

Windows XP Service Pack 3 Download link